C# UserCredential issue on refreshing token in Parallel context - linq

Question

The web application is written with C# framework net45.
The credentials are retrieved by this code:
private Task<UserCredential> GetCredentialByJSONAsync(FileInfo clientSecrets)
{
using (var stream = new FileStream(clientSecrets.FullName, FileMode.Open, FileAccess.Read))
{
var secrets = GoogleClientSecrets.Load(stream).Secrets;
var credentialsDS = new FileDataStore(_credentials, true);
return GoogleWebAuthorizationBroker.AuthorizeAsync(
secrets,
_scopes,
"user",
CancellationToken.None,
credentialsDS);
}
}
In a LINQ parallel context I get recursively the list of files to recreate the structure of the directory but sometimes happens that I receive an error:
The process cannot access the file
'Google.Apis.Auth.OAuth2.Responses.TokenResponse-user'
because it is being used by another process.
The error stacktrace is this:
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileStream.Init(String path, FileMode mode, FileAccess
access, Int32 rights, Boolean useRights, FileShare share, Int32
bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String
msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess
access, FileShare share, Int32 bufferSize, FileOptions options, String
msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
at System.IO.StreamWriter..ctor(String path, Boolean append, Encoding
encoding, Int32 bufferSize, Boolean checkHost) at
System.IO.File.InternalWriteAllText(String path, String contents,
Encoding encoding, Boolean checkHost) at
Google.Apis.Util.Store.FileDataStore.StoreAsync[T](String key, T
value) at
Google.Apis.Auth.OAuth2.Flows.AuthorizationCodeFlow.d__34.MoveNext()
--- End of stack trace from previous location where exception was thrown --- at
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task
task) at
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task
task) at
Google.Apis.Auth.OAuth2.Flows.AuthorizationCodeFlow.d__31.MoveNext()
--- End of stack trace from previous location where exception was thrown --- at
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task
task) at
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task
task) at Google.Apis.Auth.OAuth2.UserCredential.d__22.MoveNext() ---
End of stack trace from previous location where exception was thrown
--- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task
task) at
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task
task) at Google.Apis.Auth.OAuth2.TokenRefreshManager.d__12.MoveNext()
--- End of stack trace from previous location where exception was thrown --- at
Google.Apis.Auth.OAuth2.TokenRefreshManager.ResultWithUnwrappedExceptions[T](Task1 task) at System.Threading.Tasks.ContinuationResultTaskFromResultTask2.InnerInvoke()
at System.Threading.Tasks.Task.Execute() --- End of stack trace from
previous location where exception was thrown --- at
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task
task) at
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task
task) at Google.Apis.Auth.OAuth2.TokenRefreshManager.d__10.MoveNext()
--- End of stack trace from previous location where exception was thrown --- at
System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task
task) at
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task
task) at Google.Apis.Auth.OAuth2.UserCredential.d__21.MoveNext() ---
End of stack trace from previous location where exception was thrown
--- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task
task) at
System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task
task) at
System.Runtime.CompilerServices.ConfiguredTaskAwaitable1.ConfiguredTaskAwaiter.GetResult() at Google.Apis.Auth.OAuth2.UserCredential.d__17.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Google.Apis.Http.ConfigurableMessageHandler.d__71.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Google.Apis.Http.ConfigurableMessageHandler.d__69.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Google.Apis.Requests.ClientServiceRequest1.d__34.MoveNext()
--- End of stack trace from previous location where exception was thrown --- at
System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at
Google.Apis.Requests.ClientServiceRequest1.Execute() at Google.Apis.Requests.PageStreamer4.d__5.MoveNext() at
Imerys.Utilities.GoogleServices.Services.GoogleDriveService.GetFileList(FilesListOptionalParams
optional)
Do I need to manage the credentials file or does a solution already exist?